body{
    background: url(../img/登录/login_img.0c585182.png) no-repeat;
    width: 100%;
    height: 1200px;
    background-size: 100% ;
    overflow: hidden;
}
#back>h1{
    width: 500px;
    margin: auto;
    text-align: center;
    height: 200px;
    line-height: 200px;
    font-size: 30px;
    font-weight: bold;
}
#back>.content{
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 350px;
    padding: 20px 75px;
    height: 460px;
    background: #fff;
    box-shadow: 0 0 0 3px #b3c0d1;
    border-radius: 10px;
}
#back>.content>.change_box{
    display: inline-block;
    width: 172px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    border-bottom: 3px solid #fff;/*#409EFF*/
    cursor: pointer;
}
.onhide{
    border-bottom: 3px solid #409EFF!important;
}
#back>.content>.content_change{
    width: 350px;

}
#back>.content>.content_change>.yaz_box{
    margin-top: 20px;
    margin-bottom: 20px;
}
#back>.content>.content_change>.yaz_box>input{
    outline: none;
    width: 231px;
    height: 38px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    text-indent: 2em;
}
#back>.content>.content_change>.yaz_box>input::placeholder{
    color: #DCDFE6;
}
#back>.content>.content_change>.yaz_box>span{
    display: inline-block;
    width: 112px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background: #409EFF;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
}
#back>.content>.content_change>.nub{
    margin-bottom: 20px;
}
#back>.content>.content_change>.nub>input{
    outline: none;
    width: 340px;
    height: 38px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    text-indent: 2em;
}
#back>.content>.content_change>.nub>input::placeholder{
    color: #DCDFE6;
}
#back>.content>.content_change>.ddd{
    margin-top: 20px;
    margin-bottom: 20px;
}
#back>.content>.content_change>.ddd>input{
    outline: none;
    width: 340px;
    height: 38px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    text-indent: 2em;
}
#back>.content>.content_change>.ddd>input::placeholder{
    color: #DCDFE6;
}
#back>.content>.content_change>.ccc{
    margin-bottom: 20px;
}
#back>.content>.content_change>.ccc>input{
    outline: none;
    width: 231px;
    height: 38px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    text-indent: 2em;
}
#back>.content>.content_change>.ccc>input::placeholder{
    color: #DCDFE6;
}
#back>.content>.content_change>.ccc>span{
    display: inline-block;
    width: 112px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    color: #409EFF;
    border-radius: 4px;
    cursor: pointer;
}
.land{
    width: 300px;
    margin: auto;
    height: 40px;
    line-height: 40px;
    background: #409EFF;
    color: #fff;
    font-size: 16px;
    text-align: center;
    border-radius: 4px;
    margin-bottom: 20px ;
    cursor: pointer;
}
.rema{
    width: 298px;
    margin: auto;
    height: 38px;
    line-height: 40px;
    background: #fff;
    color: #409EFF;
    font-size: 16px;
    text-align: center;
    border-radius: 4px;
    border: 1px solid #409EFF;
    margin-bottom: 20px ;
    cursor: pointer;
}
.return{
    width: 300px;
    margin: auto;
    height: 40px;
    line-height: 40px;
    color: #409EFF  ;
    font-size: 16px;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
}